Switch fob electric motors



(No Model.) 5 Sheets-Sheet 1.

- AQ H. EDDY.

SWITCH FOR ELECTRIC MOTORS.

N0. 399,507. Patented Mar. 12, 1889.

1441 052555 /fl Kev/4r, I

N PETERS FhclwLMegrupher. Washmgton. I16.

(No Model.) I 5 Sheets-Sheet 2.

' A. H. EDDY.

SWITCH FOR ELECTRIC MOTORS.

N0. 399,507. Patented Mar. 12, 1889.

NY PETERS. Pnommhe n hun \Vasmnlfon. D Q

(No Model.) 5 Sheets-Sheet 3.

A. H. EDDY. SWITCH FOR ELEGTRIG MOTORS.

No. 399,507. Patented Mar. 12, 1889.

54/; 4H2 36 t 42 I 755555; M4 gfdmfgm/dwv /wi? (No Model.) .5 Sheets-Sheath.

A. H. EDDY. SWITCH FOR ELEGTRIG MOTORS.

No. 399.507 Patented Mar. 12, 1889.

ARTHUR H. EDDY, OF HARTFORD, CONNECTICUT.

SWITCH FOR ELECTRIC Morons.

SPECIFICATION forming part of Letters Patent. No. 399,507, dated March 12, 1889. Application filed September 28, 1887. Serial No. 260,932. (No model.)

To aZZ whom it may concern:

citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Electromotors, ofi

which the following is a specification.

My invention relates to improvements in electromotors; and the object of my invention is to provide effective and simple means for protecting the armature in starting the 1 motor.

In the accompanying drawings, Figure l is 3 1 broken lines in Fig. J.

used in starting the machine, the coils of the l field-magnet being in shunt with each other and in series with-the armature. diagram illustrating a motor provided with Fig. 2 is a such of my regulating devices as are used. after f the field -magnet being in series with each other and in shunt with the armature. Fig. is a plan view of a flat switch for changing the motor into the conditions illustrated in Figs. 1 and 2, the switch being set for use, as in Fig. 1. Fig. 4 is a sectional view of said switch on line .2 .2, Fig. 3. Fig. 5 is a like view of the same on line to, Fig. 3. Fig. 6 is a plan View of the same when set for use, as in Fig. 2. Fig. 7 is a sectional view of the switch on a line corresponding to the line to n, Fig.

3, but with the parts set as in Fig. 6. Fig. 8 is a plan view of said switch with some of the parts removed. Fig. 9 is a plan view of the switch-slide.

A designates the field-magnet, and B the armature, of an electromotor. The field-magnet is wound with a number of wires. The diagrams illustrate it as wound with seven wires or coils, and for convenience of illus-' tration widely separated. From the ends of the seven coils on each side of the field-magnet a like number of wires extend to contactstrips 18 to 31, inclusive, on opposite sides of the switch-board C. The switch-board has also mounted upon it contact-springs 32 and 33, and just over each of said strips the two blanks 3i and ,which blanks are connected by a plate or bar, 36. Just underneath the contact-spring 32 is a screw, 37, connected with the wire A branch, 38, of said wire sufficient speed has been attained, the coils of y is also connected with the contact-strip 31. Be it known that I, ARTHUR H. EDDY, a

Under the spring 33 is a. like screw, 39, connected with the wire The illustration in Fig. I of the contact-spring 32 and the screw 37, leading to the wire also serves to illustrate the contact-spring 33 and its screw 3!), which leads to the wire Between the first six pairs of contact-strips, on a little higher plane, there are six series springs, 40, mounted on a bar, it. l'nderneath said bar, and arranged to slide in suit- 1 able guides, is a hard-rubber slide, D, having on its under side a pair of blank strips, 12, the position of the same being indicated by Said strips are long enough to span the seven pair of contactstrips 18 to 31, as shown by the diagram Fig. 1. The slide D is also provided at one edge with inclines 43 13, for wedging under and raising the contact-springs 32 and 33, and incline 1-1, for wedging under one end of the series springs 40, and by the side of a long slot with an incline, It), for \vedging under the opposite end of said series springs. This slide is operated in one direction by a lever, E, and is held in position by a catch, 16, as shown in Fig. 3, and in the other direction by a spring, 17, Fig. 8. IVhen the slide is set in the position shown in Fig. 3, the inclines 13 lift the contact-springs 32 and 33 off from the screws 37 and 39, so as to insulateihemtherefrom, and at the same time press said blanks up against the connected blanks 3t and 35. The inclines at and also hold the ends of the series springs i0 away from all connections. At the same time the blank strips 12 are in contact with the contact-strips, and connect the strips 18 to 2% on one side and the strips 25 to 31 on the other side. This puts the parts in the condition illustrated by the diagram Fig. 1, in which the machine is in its first or starting position. The current tlowing in on the wire cannot pass the screw 37, and therefore it flows to the contact-strip 31, then through the strip 12 in contact therewith to and through all the seven strips 25 to 31, connected wires 1, 2, 3, I, 5, 6, and '7, the magnet-coils, the seven wires 11 12 13 1t 15 16 17 on the other side of the field-magnet, the seven strips 18 to 2i, the strip 21 being connected with the spring 33 by a strip, 48,

33, blanks and 3st, spring 32, wire 8, armature B, wire 9, to the wire Thus it will be seen that the several coils of the field-magnet are in shunt or parallel with each other and in series with the armature, thereby utilizing the resistance which is in the field-magnet coils to protect the armature.

After sufficient speed has been attained the switch is set in the position illustrated in Figs. 2, 6, and 7. This is done by merely depressing the catch 46 to release the lever E, when the spring e7 quickly snaps the slide into position. In making the change it is bestto have the parts act in the following order, and the quicker the changes are made the better. The contact-strips on the right-hand side (in the position shown) first break the current by their connecting-plate 42 being withdrawn. Then the total circuit is broken by the release of the springs 32 and 33 as the slide withdraws. Then the rubber slide releases the left-hand contact-strips, and the strips on both sides are put in series with the series springs 40. Next the field is closed by the spring 33 contacting with the screw 39, and the armature-circuit is closed by the spring 32 contacting with the screw 37, so that the field-coils and connected wires are in series with each other and in shunt with the armature, as illustrated in Fig. 2.

Part of the current flowing through the wire goes to the screw 0/, spring 32, wire 8,-

armature B, wire 9, to the wire and part over the branch wire 38, to strip 31, wire 1, magnet-coil, wire 11, strip 18, that one of the series springs 40 which is in contact with said strip, to strip 25, wire 7, to the opposite wire 17, to strip 19, then across to the opposite wire 6, and so on in regular order to and through wire 12 to strip 24, connecting-piece 48, spring 33, screw 39, and the wire \Vhile I prefer, and for the best results propose to use, a field-magnet wound with a number of wires or coils, it is evident that a fieldmagnet wound with only one wire may be connected in the manner described with a switch, so as to put the field and armature circuits in series in starting the machine, thereby utilizing all the resistance there is in the field to protect the armature, and after the desired speed has been attained changing the switch to put the field in shunt with the armature.

I claim as my invention 1. In an electric motor, the combination of strips 18 to 3 inclusive, series springs l0, and the slide D, having the pair of blank strips 42, substantially as described, and for the purpose specified.

2. In an electric motor, the combination of the strips 18 to 31, inclusive, series springs 40, the slide D, having the pair of blank strips 42, contact-strips S2 and 33, the latter connected with the strip 2.4, connected blanks ES-L E35, and the armature and field circuits, substantially as described, and for the purpose specified.

3. In an electric motor having a switch for changing the machine into a shunt or series machine, the combination of the switch, with a catch for holding it in its position for starting, anda spring for throwii'lg it into its second position upon releasing the catch, substantially as described, and for the purpose specified.

ARTHUR H. EDDY.

\Vitnesses:

JAMES SHEPARD, JOHN Enwanns, Jr. 

